Container for use with blood warming apparatus

• US 5,846,224 A
• Filed: 10/01/1996
• Issued: 12/08/1998
• Est. Priority Date: 10/01/1996
• Status: Expired due to Fees

• Current Assignee: Baxter International Inc.
• Original Assignee: Baxter International Inc.
• Inventors: Tadeo de Castro, Jose, Collins, John M., Sword, Randall Jay
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): Cho, David J.
• Application Number:
  US08/724,686
• Time in Patent Office: 798 Days
• Field of Search: 604/415, 604/403, 604/407, 604/408, 604/113, 219/299, 219/296, 219/298, 219/301, 219/302, 219/305, 219/308, 219/309, 219/328, 219/497-499, 219/506
• US Class Current: 604/113
• CPC Class Codes: A61M 2205/3653 by Joule effect, i.e. electric resistance
• CPC Class Codes: A61M 5/44 having means for cooling or heating the devices or media
• CPC Class Codes: F24H 1/121 using electric energy supply

Abstract

A detachable assembly for an apparatus (10) for the controlled heating of fluid is provided. The apparatus (10) has a general elongated heating core (16) with a exterior surface (36) formed of a material having a high thermal conductivity and frustoconically shaped to slidingly receive an assembly (14) so that the assembly envelops the surface along at least a portion of the length of the core. The assembly (14) forms a sealed passageway (46) for generally unidirectional unrestricted sheet like flow upward along the core (16). A control system (20) selectively operates the heating core (16) so that the fluid, under varying flow rates, is warmed to a desired temperature without overheating, before the fluid flows from the passageway (46).

Claims

1. An assembly for placing a flow of fluid in thermal contact with a warming apparatus, the warming apparatus having a heated elongated mandrel with a generally smooth, frustoconical outer surface defining a central axis, the mandrel defining a radial groove on a lower portion of the mandrel, the assembly comprising:

an outer restraint adapted to slidingly fit about at least a portion of the length of the mandrel, the restraint having two ends and an inner surface, the inner surface defining a longitudinal axis, the inner surface and outer surface of the mandrel forming a boundary for a passageway for the flow of the fluid through the assembly, the radial groove and restraint forming a boundary for an inlet manifold portion of the passageway, the inlet manifold being proximate one end of the assembly;

first means for directing an inlet flow of fluid into and along the inlet manifold; and

a sterilized bag including an inlet and an outlet and two sidewalls attached to each other to form and seal the passageway, the bag being attached to the restraint and disposed generally along the inner surface, the inner surface being shaped so that when the restraint is disposed about the mandrel, when fluid flows through the passageway, the inner surface and outer surface of the mandrel support a generally uniform separation of the sidewalls without forming pinch points over at least a portion of the length of the passageway longitudinally along the mandrel.

2. The assembly of claim 1 including a sterilized bag including an inlet and an outlet and two sidewalls, the sidewalls being attached to each other to form a sealed passageway for the fluid from the inlet to the outlet, the bag being attached to the outer restraint and disposed generally within the inner surface so that the inlet is proximate one of the end of the restraint and the outlet is proximate the other end of the restraint.

3. The assembly of claim 2 wherein the inner surface of the restraint is shaped so that when the restraint is disposed about the mandrel and the fluid flows from the inlet to the outlet, the inner surface and outer surface of the mandrel maintain a generally uniform separation of the sidewalls without forming pinch points over the majority of the length of the passageway.

4. The assembly of claim 1 wherein the restraint is shaped so that over a majority of the surface area of the mandrel, the fluid flows in a generally uninterrupted sheet like configuration within the passageway from the inlet manifold along the length of the mandrel.

5. The assembly of claim 1 wherein the first directing means is configured to direct an inflow of blood into the inlet manifold in a direction tangential to the exterior of the mandrel and generally normal relative to a longitudinal axis defined by the mandrel.

6. The assembly of claim 1 wherein the first directing means includes a bracket attached to the restraint.

7. The assembly of claim 1 wherein the inner surface is generally frustoconically shaped.

8. The assembly of claim 1 wherein the assembly is configured to engage the mandrel and dispose the assembly in the desired relative position.

9. The apparatus of claim 1 wherein the assembly includes means attached to the restraint for engaging the mandrel and establishing the desired relative position.

10. The assembly of claim 1 wherein the restraint includes a rigid shell.

11. The assembly of claim 1 wherein the assembly and the exterior surface of the mandrel are configured to form the passageway so that as fluid flows through the passageway the fluid flow forms a generally uninterrupted sheet like configuration over a majority of the surface area of the mandrel when the assembly is disposed in a desired position relative to the mandrel.

12. The assembly of claim 11 wherein the passageway is generally of a constant thickness.

13. The assembly of claim 1 wherein the restraint forms standoffs disposed generally proximate the inlet and outlet of the passageway, the standoffs configured to engage the mandrel and dispose the restraint in a desired angular position relative to the mandrel so that the passageway is of generally constant thickness circumferentially about the mandrel.

14. The assembly of claim 1 wherein the mandrel defines a second radial groove, the restraint and radial groove defining the boundary of an outlet manifold portion of the passageway, the assembly including second means for directing a flow of fluid from the outlet manifold in a direction generally aligned with the outlet manifold.

15. The apparatus of claim 14 wherein the assembly includes a flexible sidewall forming an interior wall for the passageway.

16. The apparatus of claim 15 wherein the assembly includes a bag sealingly forming the passageway.

17. The assembly of claim 15 wherein the restraint is a rigid shell.

18. The assembly of claim 14 wherein the second directing means is configured to direct an outflow of blood out of the outlet manifold in a direction tangential to the exterior of the mandrel and generally normal relative to a longitudinal axis define by the mandrel.

23. The assembly of claim 1 wherein the restraint is generally flexible.

24. The assembly of claim 14 wherein the restraint is generally flexible.

19. An assembly for placing a flow of fluid in thermal contact with a warming apparatus, the warming apparatus having a heated elongated mandrel with a generally smooth, frustoconical outer surface defining a central axis, the mandrel defining a first radial groove on a lower portion of the mandrel and a second radial groove on an upper portion of the mandrel, the assembly comprising:

an outer restraint adapted to slidingly fit about at least a portion of the length of the mandrel, the restraint having two ends and an inner surface, the inner surface defining a longitudinal axis, the inner surface and outer surface of the mandrel forming a boundary for a passageway for the flow of the fluid through the assembly, the first radial groove and restraint forming a boundary for an inlet manifold portion of the passageway, the inlet manifold being proximate one end of the assembly; and

first means for directing an inlet flow of fluid into and along the inlet manifold; and

the restraint and second radial groove defining the boundary of an outlet manifold portion of the passageway and second means for directing a flow of fluid from the outlet manifold in a direction generally aligned with the outlet manifold; and

a sterilized bag including an inlet and an outlet and two sidewalls attached to each other to form and seal the passageway, the bag being attached to the restraint and disposed generally along the inner surface.

20. An assembly for placing a flow of fluid in thermal contact with a warming apparatus, the warming apparatus having a heated elongated mandrel with a generally smooth, frustoconical outer surface extending from a first end to a second the end, the first end having a smaller radius than the second end, the mandrel defining a central axis, the mandrel forming a first radial groove formed on a portion of the first end of the mandrel, and extending about said axis generally normal to said axis and a second radial groove on a portion of the second end of the mandrel, the second groove extending about said axis generally normal to said axis, the assembly comprising:

an outer restraint adapted to slidingly fit about at least a portion of the length of the mandrel, the restraint having a first end and a second end corresponding to the first end and second end of the mandrel and an inner surface, the inner surface defining a longitudinal axis, when the restraint fitted about the portion of the length, the inner surface and outer surface of the mandrel forming a boundary for a passageway for the flow of the fluid through the assembly with the first radial groove and restraint forming a boundary for an outlet manifold portion of the passageway;

an outlet attached to the restraint proximate the first end of the restraint and arranged relative to the restraint to direct an outlet flow of the fluid from the outlet manifold in general radial direction generally aligned with the outlet manifold; and

an inlet attached to the restraint proximate the second end of the restraint and arranged relative to the restraint to direct an inlet flow of the fluid into the passageway in a generally radial direction; and

a sterilized bag including an inlet and an outlet and two sidewalls attached to each other to form and seal the passageway the bag being attached to the restraint and disposed generally along the inner surface.

21. An assembly for placing a flow of fluid in thermal contact with a warming apparatus, the warming apparatus having a heated elongated mandrel with a generally smooth, frustoconical outer surface extending from a first end to a second the end, the first end having a smaller radius than the second end, the mandrel defining a central axis, the assembly comprising:

an outer restraint adapted to slidingly fit about at least a portion of the length of the mandrel, the restraint having two ends and an inner surface, the inner surface defining a longitudinal axis, the inner surface and outer surface of the mandrel forming a boundary for a passageway for the flow of the fluid through the assembly, the restraint including a plurality of standoffs to position the restraint relative to the mandrel;

an inlet to the passageway attached tot he restraint at a first end of the restraint and the outlet attached to an opposite end of the restraint;

the inner surface being configured in a generally smooth frustoconical configuration such that the passageway provides for flow of fluid in a generally sheetlike configuration extending from said first end to said opposite end; and

a sterilized bag including an inlet and an outlet and two sidewalls attached to each other to form and seal the passageway, the bag being attached to the restraint and disposed generally along the inner surface.

22. The assembly of claim 21 wherein the inner surface of the restraint forms the passageway with a generally uniform thickness substantially free of pinchpoints along a majority of the length of the passageway.